SharePoint 2013 error A potentially dangerous Request.Path value was detected from the client (%) on intranet/mysites access requests from email link

I had a link in my email inbox for “User wants access to ‘Intranet'” sent from the user to myself. I am the Intranet site Owner and recieve access requests.

There is a link to “Accept or Decline this request”

If I click accept from the email Link, I get a SharePoint error:

Sorry, something went wrong
An unexpected error has occurred.

Correlation ID: 00000000-0000-0000-0000-000000000000

Date and Time: 8/5/2013 3:19:39 PM


Go back to site

I took a look in the ULS logs and found this error when I requested the page:

08/05/2013 14:56:19.09 w3wp.exe (0x2BCC) 0x26C4 SharePoint Foundation Runtime tkau Unexpected System.Web.HttpException: A potentially dangerous Request.Path value was detected from the client (%).    at System.Web.HttpRequest.ValidateInputIfRequiredByConfig()     at System.Web.HttpApplication.PipelineStepManager.ValidateHelper(HttpContext context)

08/05/2013 14:56:19.09 w3wp.exe (0x2BCC) 0x26C4 SharePoint Foundation General ajlz0 High Getting Error Message for Exception System.Web.HttpException (0x80004005): A potentially dangerous Request.Path value was detected from the client (%).     at System.Web.HttpRequest.ValidateInputIfRequiredByConfig()     at System.Web.HttpApplication.PipelineStepManager.ValidateHelper(HttpContext context)

08/05/2013 14:56:19.09 w3wp.exe (0x2BCC) 0x26C4 SharePoint Foundation General aat87 Monitorable

08/05/2013 14:56:19.10 w3wp.exe (0x2BCC) 0x26C4 SharePoint Foundation General ajb4s Monitorable ViewStateLog: Failed to write to the velocity cache: https://intranet/Access Requests/pendingreq.aspx

The URL from the email is: https://intranet/sites/BI/Access%2520Requests/pendingreq.aspx

The link was %2025, as soon as I went to Site Settings > Access requests and invitations, The page loaded and the URL was https://intranet/sites/BI/Access%20Requests/pendingreq.aspx#InplviewHash45f07088-94ce-4184-8700-e90e139485fb=#InplviewHashb2af6c82-aa6b-402e-97f7-b7503c93b415=

Note how the URL is %20, not %2520. This was the cause of the error.

Environment: Windows Server 2012 with SharePoint 2013 March 2013 Public Update.

For now, use the UI or manually change the link. I am reporting this issue to Microsoft and will update this if I find anything out.

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5 thoughts

  1. Never heard back from Microsoft on this issue. I posted it on Yammer on August 5th in the “SharePoint Technical” group.

    1. nope, I never heard back from Microsoft on this and have not had an issue for a while. The error had something to do with my cell phone and %20 not being recognized as a space in the URL. If you have Technical Advisory hours, you can open a case with Microsoft. I have opened a few this year already, some of which couldn’t be resolved or verified.

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